Sanding attachment for drill presses



Aug. 22, 1950 A. L. CAREY ET AL SANDING ATTACHMENT FOR DRILL PRESSESFiled Feb. 15, 1947 IN VEN TOR. A

IIll'llllllIllf' Patented Aug. 22, 1950 SANDING ATTACHMENT FOR DBILPRESSES Albert L. Carey and Justin V. Anslinger, Kank'akce, 111."

Application February 15, 1947, Serial Nofvzsass 9 Claims. (01. 51-241)The present invention relates to an attach ment for a drill presswhereby a drill press may be used as an oscillating spindle sander.

The main object of the invention is to provide a sander which may besecured to a drill press without the use of clamps, special attachingbrackets, or other loose parts. More spe- '--cifically, it is an objectof theinvention to provide a unitary sanding attachment for a drillpress. I

A further object of the invention is to provide a sanding attachmentwhich is so constructed that it may be mounted on a drill press by useof the ordinary depth gauge of the drill press.

Applicants have discovered that a sanding cylinder, specifically acylinder formed of a helically wound sanding sheet if snugly fitted on asmooth faced rod secures itself against rela- "tive movement on the rod.and remains secured thereto against removal except against hand removalby a slow rotation and axial pull. It is therefore both an object and anadvantage of the invention to provide a sanding drum consisting of asmooth faced rodand a sanding cylinder, preferably a helically woundsanding sheet, snugly fitted on the rod and solely secured therebyagainst movement relative to the rod during the use of the sanding drum.

. Other and further objects and advantages of through the drill pressshowing the manner of attachment thereon.

Fig. ,3 is a view in horizontal section taken along the line 3-3 of Fig.2. H

Fig. 4 is a fragmentary view in vertical section taken along the line 4--4 of Fig. 2.

As shown in the drawings, a sanding attach-- Ement embodying theinvention is designed for attachment to a standard drill press 4 havingthe usual tool receiving rotary chuck 6, a depth gauge 8 which extendsupwardly from a clamping collar I secured to the rotary and manually,depressible spindle l2. The standard drill press =-is also providedwith a work table 14 secured by a horizontal pivot to a clamping collar16 on the .press column [8. This pivoting of. the table I4 :permits, asis well known, angular adjustment of, the table to differently inclinedpositions.

The attachment 2,,as best sho wnin Figs. 2 to 4,

preferably comprises a housing or support 20 including a casting havingone open side wall which may be closed by a cover plate 22 suitablybolted or otherwise secured to the housing casting. The support orhousing 20 may be formed with an integral laterally extending bracketportion or lug 24 drilled to provide a suitable aperture 26 to receivethe free end of the depth gauge 8 when the same is inverted on theclamping collar ID as shown in the drawings. The support or housing issecured to the depth gauge or rod 8 by being clamped between the depthcontrolling and clamping nuts 28 and 38 of the depth gauge.

The housing 20 is provided in its upper and lower ends with aperturedbosses 32 and 34 receiving bearings 36 in which is journaled a firstspindle $8 receivable in the chuck 6 of the drill press for rotationthereby.

The housing is also provided in its upper and lower ends in spacedrelation to the bosses 32 and 34 with a second pair of aligned bossesand 42 apertured to receive similar bearings 44 in which is journal'ed asecond spindle 46.

The spindle 46 is also journaled in a bearing 48 mounted in an apertureof a lug or bracket 50 extending inwardly from, and formed integrallywith, a side wall of the housing 28. The spindle 45 is journaled inthese bearings 44. and 48 for both rotary motion and verticalreciprocation.

The bearing 48 is mounted on a lug 553 in such .manner that its annularflange 52 rests thereon Iand forms a seat for a spur gear 54 splined tothe spindle 46 by means of a pin or set screw 55 in the hub of the gearand received in the longi- -'t'udina1 key slot 58 of the spindle 46. Thegear 54 meshes with and is driven by a like geartfl fixed to the spindle38 as by the set screw 62. It will be evident that the spindle 38 causesrotation 'of the spindle 46 :by means of the gears 60 and 54.

Spindle 38 is also provided adjacent the lower end of thehousing with aworm gear 64 having a reduced hub portion 66 interfitted with a collar88 having an enlarged axial opening at one end to receive the hub of theworm gear. The collar 68 and worm gear 64 are secured to the spindle 38by a pin 10 fitted in transverse openwith the side wall of the housing20. The worm wheel 12 is provided with an eccentric pin 18 received in aslot 8|! of a slotted yoke which consists of a block 82 loosely mountedon the spindle 46 and held against rotation with the spindle byengagement of the confronting faces of the block and worm Wheel. Theyoke is held in fixed position against movement longitudinally of thespindle by means of clamping collars 84 pinned to the spindle 46.

It is to be noted that the wormwheel rotates about an axis which isnormal to the axis of the spindle 46 and that the axis of rotationo'fthe worm wheel is offset slightly from:aavertical plane which includesthe axis of rotation of the spindle 48. This offsetting of the two axes.assures smooth reversal of the movement of the spindle 46 as it reachesits opposite extremes of reciprocating movement.

The spindle 46 extends below the housing '20 to receive a sanding drumpreferably consisting of a smooth faced rod 88 detachably secured to thespindle as by setscrew 9H. Thesandingcyl- "inder 92, which preferablycon-sists of a-'-standard 'helically wound sandingsheetforhred into apermanent cylinder, snuglyfits-'on-thesmooth faced *rod 88. Applicantshave "discovered-that a san'ding cylinder snugly fitted n therod-requires no other holding means and'that itwill not -come loose fromthe rod or moverelative to the rod during use, even though "a maximum of-pressure 'is exerted by the work again'st the *face of the sandingcylinder. The cylinder may, however, readily'be removed by manuallyturning the-cylinder'at a slow rate while holding the rod '88 stationaryif at the same timeaslight axialpull *isexerted on the sanding cylinder.

To mount and "operate the attachment, the ;depth control gauge 8whichnormally extends "upwardly from the ring lfl 'isreleasedther'efrom.and resecured thereto-in 'an'inverted position. ".The clamping nut 38is then removed from'the "now lower end of the depth control gauge 8 and.thelug portion 24 of'the housing"2fl*passe'd :over the lower end ofthe'ro'd. The'clampinghut "3'0 is then tightened againstthelower'surfaceof the lug'so that the housingis securedtothe rodbetween.thenuts 28 and 30. At the timethehousinglugis placed on the rod, thespindle fillisintroduced'into the 'chu'ckt'and the chuck tightene'd sothat it isinproper*driving engagement with the spindle 38.

"Thelsandingdrumhaving been mounted'onthe "lower .end of the spindle'46, the 'Work tablelflis :adjusted to align one oftheholesthereimtusuailly "the central hole 15, 'with the sanding drum sothatthe drum may pass .down .throug'hzthe work 'tta-ble to sand the wall'or :ahole :or the internal or external edge surface of'work plac'ed "onthe work table. 'It will of. coursefbeievident that the table l4.may beadjustecl'to anyidesired'incline'd ;position to sand an "inclined "edgeor surface of 1 *the work.

As the chuck 6 of the drill press is'rotate'd, the spindle 38 is rotatedthereby "to effect, "through the gears'60 and FL-simultaneous *rotationof the spindle-46 at substantially the'same speed. Simultaneously withits rotation, "the spindle 46 is causedto reciprocate vertically-at amuch lower rate of speed. "reciprocation is effected by the worm gear (il-"on thespindle 38 which rotates the worm wheel 12 and the Hatter bymeans of the eccentric :pm 1 8 recipro- -cates the slotted yoke 82 at aspeed determined "iby the gear reduction afforde'dby'the worm gear Blandworm gear 12. Thus,"the-sanding drumis 4 simultaneously reciprocatingvertically at a much lower speed to effect the desired sandingoperation.

It will be evident that applicants have provided a relatively simple,inexpensive and rugged sanding attachment of the oscillating spindletype having the advantages and fulfilling the objects of inventionheretofore set forth While certain specific "structures have beendisclosed herein for the purposes of illustrating "our invention, itwill be apparent that variations and changes may be made withoutdeparting from the spirit and scope of the appended claims.

What we claim is:

=1.*In combination with a drill press having a "chuck and a stationaryrod suspendable from the frame of the .L-PJIGSS in close parallelrelation to the chuck, an attachment comprising a unit including ahousing having a bracket extending laterally therefrom for attachment tosaid rod, a fispindle mounted in "said :housing :exten'ding.tlrerea'bove ifor insertion 2111 said echu ck, 2a second spindlerotatably :reciprocably mounted :in said :housing :and extendingtherebelow, gear :means in saidhousing-interconnectingsaidshafts for.causing rotation -.of the second spindle on rotationxifthe.zfirstspindlevand motion convert- Ring mechanismzmoun-ted :in saidhousing and interconnecting said :spindlessfor (causing reciproecationof the :SEGOIIdTSDiHdlBIIOIi rotationof the first spindle, and :a:rotatable :and .reciprocable Itookmcunted .on themortionlof the secondspindleiprojecting beneath saidzhousing.

:2. .:A :drum fisander comprising :a smooth faced rrig'id rod :having .auniform rand constant cross- .sectional area and ;-a sanding cylinderinternally smooth-faced and snuglyfitting therodzand soleilyisecuredthereby against: movement relative to theerod.

3. A drum :sander :comprising :a-smooth faced :rigidfrod-havingaiconstant cross-sectional area and a rhelically'woundrcylinder of anabrasive .sheetrrhavinga smooth,.internal face and snugly :fittingthemed and solely secured thereby against imovement relative atouthe:rod.

4..;Assandingnattachment for a drillpresshaving a chuck and-nagauge,said attachment comprising :a unit, including a vhousing having anintegral laterally "extending lug apertured to receive the :depth gauge:wheminverted'lfor mounting of the housing thereonpafirstzspindlejourrnaled .in the housing and :extending from .the :upperrend thereofor.:inser.tion@in :the chuck of the drill press, a second spindlerctatablyand 'reciprocabl-y .mounted in tlre housing :and :projectingtherebelow, :means interconnecting athe spindles for causing rotationzcf:the second-spindle on rotation of the first-spindle, -a dis'khaving aneccentric pin mountedin said 'hOLlSiIlg for rotation about an axissubstantially normal to the axis of rotation :of the second "spindle, aslotted yoke 10Os1ym0llrit8d0nlthe second spin- 'dle and ..securedagainst relative movement in a "direction longitudinally thereof, theeccentric 'pin on the wheel interfitting 'in the slot of said yoke, andmeans interconnecting the first spindle and said wheel 'causing rotationof" the wheel on rota-- tion of the first spindle wherby the secondspin- "dle :is simultaneously rotated and reciprocated, and asanding-drum mountable on the portion of the secondspindle projectingbelow said housing.

5. A-sanding attachment'for a drill-press having a chuck and aninvertible depth gauge, a housing having an integral, laterally*exten"ding caused to rotate at a 'relatively' high speed -while (lugapertured to *receive the depth gauge when inverted for mounting thehousing on said gauge, a first spindle journaled in the housing andextending from the upper end thereof for insertion in the chuck of thedrill press, a second spindle rotatably and reciprocably mounted in thehousing and projecting from the lower end thereof to receive a sandingdrum, intermeshing gears on the spindles within the housing and adjacentone end of the housing for causing rotation of said second spindle uponrotation of the first spindle, a worm wheel mounted in the housingadjacent the opposite end of the housing for rotation about an axisnormal to the axis of the second spindle, a worm gear secured to thefirst spindle and meshing with the worm wheel, an eccentric pin on theworm wheel, a slotted yoke receiving the pin and loosely journaled onthe second spindle but secured thereon against axial movement forcausing reciprocation of the second spindle on driving of the worm wheelby the worm gear.

6. In combination with a drill press having a rotary chuck and asupporting frame, an attachthe first spindle, whereby the second spindleis ment comprising a support having an apertured bracket for readyattachment of said support to said frame and detachment of said supportfrom said frame, a spindle rotatably mounted on said support and adaptedto be inserted in said chuck for rotation thereby, a second spindlerotatably mounted adjacent to and parallel to said first spindle, saidsecond spindle being reciprocably mounted on said support, meansinterconnecting said spindles whereby to cause rotation of said secondspindle upon rotation of said first spindle, and means interconnectingsaid spindles 'whereby said second spindle is reciprocated in saidsupport upon rotation of said first spindle.

7. In combination with a drill press having a rotary chuck and aninvertible depth gauge, an attachment comprising a support apertured forattachment to the depth gauge when said gauge is inverted, a firstspindle rotatably mounted on said support and projecting thereabove forinsertion in said chuck to be rotated thereby, a second spindlerotatably and reciprocably mounted on said support adjacent to andparallel to said first spindle, said second spindle extending below saidsupport and being adapted to receive a work tool, means interconnectingsaid spindles whereby said second spindle is rotated upon rotation ofsaid first spindle, and means interconnecting said spindles whereby saidsecond spindle is reciprocated within said support upon rotation of saidfirst spindle.

8. An apparatus comprising a housing, a first spindle journalled in thehousing and extending from the upper end thereof for attachment to adriving means, a second spindle rotatably and reciprocably mounted inthe housing and prosimultaneously rotated and reciprocated.

9. A mechanism comprising a housing, a first spindle journalled in saidhousing and extending from the upper end thereof for attachment to adriving means, a second spindle rotatably and reciprocably mounted insaid housing and projecting from the lower end thereof to receive atool, intermeshing gears on the spindles within the housing and adjacentone end of the housing for causing rotation of said second spindle uponrotation of the first spindle, a worm wheel mounted in the housingadjacent the upper end of the housing for rotation about an axis normalto the axis of the second spindle, a worm gear secured to the firstspindle and meshing with the worm wheel, an eccentric pin on the wormwheel, a slotted yoke receiving the pin and loosely journalled on thesecond spindle and secured thereon against axial movement for causingreciprocation of the second spindle on driving of the worm wheel by theworm gear.

ALBERT L. CAREY.

JUSTIN V. ANSIJNGERJ.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 154,756 Howe Sept. 8, 1874170,178 Locke Nov. 23, 1875 238,284 Hapgood Mar. 1, 1881 295,900Birkenhead Apr. 1, 1884 1,564,574 Hunt Dec. 8, 1925 1,881,839 MonsonOct. 11, 1932 1,929,274 Ellis .1. Oct. 3, 1933 2,043,017 Stubbs June 2,1936 2,108,029 Connor Feb. 8, 1938 2,242,781 Gideon May 20, 19412,244,813 Tommerup June 10, 1941 2,402,946 Brown July 2, 1946 FOREIGNPATENTS Number Country Date 327,525 Germany Oct. 13, 1920

